Fuel-saving device



Maren 18, 930. w. E. RQTHERM'EL 1,751,175-

. FUEL SAVING DEVICE Filed July so, 1928 2 Sheets-Sheet 1 Patented Mar.18, 1930 WILLI AM E. ROTHERMEL, OF CHICAGO, ILLINOI$ FUEL-SAVING DEVICEApplication filed July so, 1928. Serial in). 296,174.

This invention relates, to improvements in fuel saving devices, and moreespecially to such a device adapted for attachment to a furnace, heater,stove, boiler, or the like.

One of the features of my invention is the provision of a mechanism orcontrivance adapted to be fastened to the inside of the feed door sothat air entering through openings in the door will pass through thedevice and also around it in contact with its outer Walls, thus becomingpreheated so that as it comes in contact and mixes with the gases of thefuel bed combustion will be promoted, such mixing of preheated air withthe gases of the fuel bed also reduces the smoke and lessens soot. Theincreased efiiciency in combustion produced by my device naturallyresults in fuel economy.

My device also operates to insulate the feed 29 door, or other parts ofthe wall of the combustion chamber, where the device is used, to

prevent loss of heat.

Other features and advantages of my invention will appear more fully asI proceed with my specification.

In that form of device embodying the features of my invention shown inthe accompanying drawings, Figure 1 is a view in front elevation of afeed door; Fig. 2 is a rear view 39 of the same showing my fuel savingdevice attached; Fig. 3 is a view similar to Fig. 2

showing the vertical section of the device;

Fig. 4 is a View taken as indicated by the line 4 of Fig. 3; and Fig. 5is a view taken as in- 35 dicated by the line 5 of Fig. 3.

As shown in the drawings, 10 indicates, in general, any furnace, stove,boiler, heater, or

the like, and 11 the feed door for the fuel 7 feed passage in one wallthereof. 12 indicates the butterfly valve air regulator or damperattached to the feed door to regulate the amount of air entering thecombustion chamber above the fuel bed.

My improved fuel saving device comprises a substantially rectangularchamber 13 adapted for attachment at the inside of the door in anysuitable manner. The chamber 13 is preferably spaced inwardly from thedoor a short distance to leave the space 14.

It may be supported in any suitable manner;

5. The outer or front face of the chamber 13 is indicated by 13 and theinner or rear face is indicated by 13. The front face 13 is providedwith a centrally arranged opening 17 for the admission of air into thedevice. Inside of the chamber 13 are arranged baflieplates 18 around thecentral opening 17 so that air enter to the outlet of the rear or ingsaid openings must follow a tortuous passage through the chamber13openings 19 in the loweredge inner face 13. Passage of air through thedevice is indicated by the arrows. The outlet openings 19 need notnecessarily be in the lowe r edge of the face 13. For example, if thelevel of the fire bed is relatively high these openings may be located.correspondingly h placed anywh igher. In fact, they may be ere in theinner face, thoughof course it would not be advisable to place them inthat p ortion of the face directly opposite the opening 17 as little orno baffling effect would the n be obtained.

It is to be particularly noted that the chamber 13 is spaced inwardly a'short distance from the feed 14 between.

door 11 so as to leave the space Consequently, some of the air enteringthrough the feed door will not pass into the openi wardly aroun ber 13and in by the arrows, the outer wal preheated.

entire chambe ng 17, but will be deflected outd the outer walls of thechamcontact therewith, as indicated such air coming in contact with lsof the chamber will also be t is to' be understood that the r is heatedboth by radiant and sensible heat from the combustion in the combustionchamber, and consequently air passing through the chamber around thebattles 18 will also through the o chamber.

be preheated before escaping penings 19 into the combustion The chamber13 having a double wall and lying inside of the feed door acts as aninsulator for the feed door, thus conserving the heat in the combustionchamber. Acting as such insulator for the feed door, the usual feed doorinsulator lining to protect the same from heat may be dispensed with. p

It is -to'be noted that the chamber .13Lis readily removable from thefeed door by tuous passage to be followed by the air in its lifting theends 15 of the bars 15 out of the sockets 16. The device'may,vtherefore,-be readily removed for cleaning, repairing or replacement.

While I have shown and described certain 7 embodiments of my invention,it is to-b e" understood that it iscapable of many-.modifi'cations:Changes, therefore, in the construction and arrangement may be madewithout'departi-ng from the spirit and scope ofthe invention asdisclosed in the appended claim, in which'it is my invention to claimall noveltyinherent in my invention as broadly'as'possibleiinview oftheprior art.

WhatI claim as new, and desire to secure by Letters Patent, is:

In combination with a fuel-feed passage of'af'urnaceior'the like and adoor therefor 'provided' with a damper, an air-heating cas- V 1ng, ba'r'means connectlng'the door and casingiandnormallydisposing the latter insaid passage-inspaced relation to the door and to thewalls oftliepassage, said casing having its'marginal wall inwardly tapering and alsohaving a centrally-arranged air inlet opening facing said-door, wherebythe airpassing the.

damper will partly pass around said marginal wall. and wi'll partlyenter said opening, and the casing adjacent its'innerlowericornerhaving, air outlet openings, and

bafiie means in said casing providing a tor-.

travel fromsaid inlet means to said outlet means. 7 v

In witness :whereofll have hereunto set my hand,ythis 26th day of July,1928.

WILLIAM- E. BOTHERMEL.

